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Reagents and conditions: (a)619 LiOH/H2O, THF, 24 h; (b) O2; (c) 1,2-phenylenediamine hydrochloride, pyridine, TFA, reflux; (d) 1,8-diaminonaphthalene hydrochloride, pyridine, TFA, reflux; (e) CH2N2, DCM, N-methyl-N-nitroso-p-toluenesulfonamide, rt, overnight.
